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Keeping time has always been a problem for computers, as their internal clocks needed something to synchronize with. If you have an Internet connection and use Windows, you can get the time adjusted regularly using a time set function from Windows online. The CMOS battery will have little to do with time settings, unless it goes bad. Then, not only will your date and time go out of sync, so can many other settings in the CMOS. So, unless you are getting a low battery warning, or both the date and time are out of sync, you probably don't need a new CMOS battery and replacement probably won't fix you time drift issue.

In Windows 10, to get auto time sync, go to "Settings", then select "Date and Time". Under this you will see an option to "Set Time Automatically", as well as to select your time zone.

CMOS stands for Complementary Metal-Oxide Semiconductor. It is basically a chip in the mother board that stores information such as your system hardware settings and date and time. It is powered by a battery the size of a small coin. Without the CMOS battery, your computer will revert to original manufacture hard ware settings every time you turn on your computer. If you keep having to set the correct date and time of your computer every time you turn it on, then it's time to replace the CMOS battery. I hope that helps.

The CMOS (BIOS) battery keeps the computer'a comfiguration and the Date & Time settings in the CMOS (BIOS) chip in its memory. When the CMOS (BIOS) battery is flat these configuration information is lost.Replace the CMOS battery with a new one, in most cases this battery is a lithium 3 volt battery type CR2032 and it is coin size battery 18mm in dia.(check it to make sure the type of battery is installed on your motherboard). When you replace this battery then go into the BIOS and set the Date & Time etc.

Just replacing the battery will not set anything. You have to do the setting of the values. If you can run setup by pressing F1, then do that and set all the settings and then save before exiting. Make sure you save the settings by choosing the correct exit and re-boot option.If the settings cannot be set nor saved, then make sure the poser is off or pull the plug from the wall outlet, then short the bios with the jumper to short the bios. This will reset the bios to the default settings. Turn on the system and then go to the bios settings and set the settings. Then use the reboot option to save the settings.

Hi, if you're system does not keep the correct date & time it is possible the cmos/bios battery on the motherboard has reached it's max life span. The bios battery recharges only when the system is on. In many cases even when the system is on & you correct the date & time & notice the time is off the battery needs replaced.
How to replace cmos battery:http://www.computerhope.com/issues/ch000239.htm